They are two of the more bizarre findings in medicine, with two of the strangest names, and they both affect the tongue. If you think about it, we rarely talk about the tongue, but the terms geographic tongue and hairy tongue are actual medical terms. Believe it or not, geographic tongue affects as many as 1 out of 10 people. In a geographic tongue, part of the tongue becomes flat and smooth which makes it stand out when compared to the rest of the tongue with raised borders. In hairy tongue, an accumulation of tissue called keratin develops on the tongue and that leads to elongated debris.
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